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<title>Problem 1109. -- [POI2007]堆积木Klo
</title><center><h2>1109: [POI2007]堆积木Klo
</h2><span class=green>Time Limit: </span>10 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>162 MB<br><span class=green>Submit: </span>334&nbsp;&nbsp;<span class=green>Solved: </span>96<br>[<a href='submitpage.php?id=1109'>Submit</a>][<a href='problemstatus.php?id=1109'>Status</a>][<a href='bbs.php?id=1109'>Discuss</a>]</center><h2>Description</h2><div class=content>Mary在她的生日礼物中有一些积木。那些积木都是相同大小的立方体。每个积木上面都有一个数。Mary用他的所有积木垒了一个高塔。
妈妈告诉Mary游戏的目的是建一个塔，使得最多的积木在正确的位置。一个上面写有数i的积木的正确位置是这个塔从下往上数第i个位置。Mary决定从现有的高塔中移走一些，使得有最多的积木在正确的位置。请你告诉Mary她应该移走哪些积木。
</div><h2>Input</h2><div class=content>输入文件的第一行为一个数n，表示高塔的初始高度。第二行包含n个数a1,a2,...,an，表示从下到上每个积木上面的数。(1<=n<=100000,1<=ai<=1000000)。

</div><h2>Output</h2><div class=content>注意：请输出最多有多少点可以处在正确位置</div><h2>Sample Input</h2>
			<div class=content><span class=sampledata>5<br />
1 1 2 5 4<br />
<br />
</span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata>3</span></div><h2>HINT</h2>
			<div class=content><p><img border="0" src="images/1109_1.jpg"><br />
<img border="0" src="images/1109_2.jpg"></p></div><h2>Source</h2>
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